Go to this link:
http://www.vixenamerica.com/Products...asp?Extra=Help
And scroll down the page until you get to:
Manual Clutch (AM-MC)
MT-1 Motor Installation Pages 19 and 20 of the Vixen GP-series Mount manual with instructions on installation of MT-1 motors with and without the manual clutch. Requires Adobe Acrobat Reader
And see if that helps.
Cheers
Dennis